XR-1 Multi-Core

XR-1(r) Multi-Core Racing Muffler. 4" Center Inlet/ 4" Center Outlet 6.25" Round x 23" Long Body 28" Overall Length. Long body design works well on SUV & truck applications but can be used on a wide range of vehicles including rotary engine equipped vehicles. It features BORLA(r)'S patented Multi-Core 6 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1(r) mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel for superior corrosion resistance. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High temperature T-304 stainless steel wool packing for sound control. Best of all, it's made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.

Additional Information

XR-1 Multi-Core Racing Muffler Full Bodied Cars - 4" Center Inlet/ 4" Center Outlet 5.5" x 8.5" Oval 23" Long Body 28" Overall Length. Universal Part. Reversible Design.

Part Type

Exhaust Muffler

Product Overview

BORLA XR-1 Raceline products are the choice of todays hottest drag and oval track racers. Featuring a patented uninerrupted-flow design and multicore technology. BORLAs XR-1 mufflers actually outflow a straight piece of pipe in repeated testing. XR-1 race products are light weight and constructed of high quality austenitic stainless steel for track-tough durability. They meet the strictest noice requirements and use sound absorbing stainless steel pcking to protect against burnout. Hands down, BORLAs XR-1 Raceline offers the best balance of sound and power.

• 4" Center Inlet/ 4" Center Outlet 5.5" x 8.5" Oval x 23" Long Body 28" Overall Length
• Can be used on a wide range of vehicles including rotary engine equipped vehicles
• Long body design works well on SUV & truck applications
• Multi-Core 6 tube internal design. High temperature SS wool for sound control
• Universal muffler. Reversible design.

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Product Details

Reference Information

Muffler, XR-1, Round, 4 in. Center Inlet/Outlet, 27 in. Overall Length, Stainless Steel, Each

Whether you're drag racing or Circle Track racing, Borla has an XR-1 racing muffler for you. In fact, the 16 in. Shootout mufflers are rated the highest-flowing mufflers on the market.

Features include:
• Straight-through design for maximum flow
• Aircraft-quality T-304 stainless steel construction for reduced weight that will never rust
• All-welded, one-piece design for increased structural integrity
• Stainless steel, sound-absorbing material to protect against burnout